OPC UA Client connection detection - PLCS.net

swedeleaner · April 7th, 2021, 11:29 AM

Ohh hai!
Is there a clever way to detect if there is a UA Client connected in the UA Server.
Using iX Developer 2.40 if its of any help.

The idea was to show in the HMI (UA Server) if the SCADA-computer running Kepware (UA Client) is connected, thus showing that the 4G-link is ok.

So, any ideas?

goghie · April 7th, 2021, 01:59 PM

Make SCADA write it's seconds to HMI register. If the mentioned HMI value is not changed after two seconds - SCADA connection is lost.

lfe · April 7th, 2021, 02:52 PM

Verified in a United Automation OPC UA Server :

On the OPC UA Server Nodes Tree

On Objects >> Server >> ServerDiagnostics >> ServerDiagnosticsSummary >> CurrentSessionCount there is a Variable that contains the number of active client sessions

The value should be incremented if a new client connects.

mk42 · April 7th, 2021, 11:14 PM

Quote:

Originally Posted by lfe

Verified in a United Automation OPC UA Server :

On the OPC UA Server Nodes Tree

On Objects >> Server >> ServerDiagnostics >> ServerDiagnosticsSummary >> CurrentSessionCount there is a Variable that contains the number of active client sessions

The value should be incremented if a new client connects.

Downside is that that data isn't usually available within the server itself (unless it tries to connect to itself as a client, lol).

lfe · April 8th, 2021, 10:53 AM

Quote:

Originally Posted by mk42

Downside is that that data isn't usually available within the server itself (unless it tries to connect to itself as a client, lol).

He does not only have an isolated OPC UA server but a HMI that incorporates an OPC UA server, it would make little sense that he could not access his server from the HMI

mk42 · April 8th, 2021, 10:57 AM

Quote:

Originally Posted by lfe

He does not only have an isolated OPC UA server but a HMI that incorporates an OPC UA server, it would make little sense that he could not access his server from the HMI

I've never used that specific product, so I can't say for sure. I just know that the HMIs I've used with built-in OPC UA Servers didn't have that information readily available in existing internal tags, it'd need to connect to itself to get the details.

swedeleaner · April 8th, 2021, 03:54 PM

Mk42, spot on. Spoke to Beijer about it and they pointed me to your solution. Adding an additional Client in the HMI and from that Client pull out the connection from the server..

Feels like a silly solution but what to do.

Thanks any way guys!

mk42 · April 8th, 2021, 06:55 PM

Quote:

Originally Posted by swedeleaner

Feels like a silly solution but what to do.

Totally in agreement, but such is life. glad you got it sorted out!

lfe · April 9th, 2021, 08:29 AM

Quote:

Originally Posted by swedeleaner

Mk42, spot on. Spoke to Beijer about it and they pointed me to your solution. Adding an additional Client in the HMI and from that Client pull out the connection from the server..

Feels like a silly solution but what to do.

Thanks any way guys!

Sorry, but the one who suggested reading the server diagnostics was me hehe.

April 7th, 2021, 11:29 AM	#1
swedeleaner Member Join Date: Dec 2013 Location: Göteborg Posts: 104	OPC UA Client connection detection Ohh hai! Is there a clever way to detect if there is a UA Client connected in the UA Server. Using iX Developer 2.40 if its of any help. The idea was to show in the HMI (UA Server) if the SCADA-computer running Kepware (UA Client) is connected, thus showing that the 4G-link is ok. So, any ideas?

April 7th, 2021, 02:52 PM	#3
lfe Member Join Date: Jun 2007 Location: Barcelona Posts: 619	Verified in a United Automation OPC UA Server : On the OPC UA Server Nodes Tree On Objects >> Server >> ServerDiagnostics >> ServerDiagnosticsSummary >> CurrentSessionCount there is a Variable that contains the number of active client sessions The value should be incremented if a new client connects. __________________ Suppanel HMI

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April 7th, 2021, 01:59 PM	#2
goghie Supporting Member Join Date: Jan 2008 Location: Belgrade Posts: 413	Make SCADA write it's seconds to HMI register. If the mentioned HMI value is not changed after two seconds - SCADA connection is lost.

April 8th, 2021, 03:54 PM	#7
swedeleaner Member Join Date: Dec 2013 Location: Göteborg Posts: 104	Mk42, spot on. Spoke to Beijer about it and they pointed me to your solution. Adding an additional Client in the HMI and from that Client pull out the connection from the server.. Feels like a silly solution but what to do. Thanks any way guys!

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